June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Handling interrupts from GPIO
In many cases, a GPIO input can be configured to generate an interrupt when it changes state, which allows you to wait for the interrupt rather than polling in an inefficient software loop. If the GPIO bit can generate interrupts, the file called edge exists. Initially, it has the value called none, meaning that it does not generate interrupts. To enable interrupts, you can set it to one of these values:
- rising: Interrupt on rising edge
- falling: Interrupt on falling edge
- both: Interrupt on both rising and falling edges
- none: No interrupts (default)
You can wait for an interrupt using the poll() function with POLLPRI as the event. If you want to wait for a rising edge on GPIO 48, you first enable the interrupts: ...
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